US6155969A - Centrifugal pump for pumping blood and other shear-sensitive liquids - Google Patents
Centrifugal pump for pumping blood and other shear-sensitive liquids Download PDFInfo
- Publication number
- US6155969A US6155969A US09/230,125 US23012599A US6155969A US 6155969 A US6155969 A US 6155969A US 23012599 A US23012599 A US 23012599A US 6155969 A US6155969 A US 6155969A
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- United States
- Prior art keywords
- pump
- rotor
- drive
- magnets
- intake
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- Expired - Fee Related
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/046—Bearings
- F04D29/048—Bearings magnetic; electromagnetic
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/10—Location thereof with respect to the patient's body
- A61M60/104—Extracorporeal pumps, i.e. the blood being pumped outside the patient's body
- A61M60/109—Extracorporeal pumps, i.e. the blood being pumped outside the patient's body incorporated within extracorporeal blood circuits or systems
- A61M60/113—Extracorporeal pumps, i.e. the blood being pumped outside the patient's body incorporated within extracorporeal blood circuits or systems in other functional devices, e.g. dialysers or heart-lung machines
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/20—Type thereof
- A61M60/205—Non-positive displacement blood pumps
- A61M60/216—Non-positive displacement blood pumps including a rotating member acting on the blood, e.g. impeller
- A61M60/226—Non-positive displacement blood pumps including a rotating member acting on the blood, e.g. impeller the blood flow through the rotating member having mainly radial components
- A61M60/232—Centrifugal pumps
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/30—Medical purposes thereof other than the enhancement of the cardiac output
- A61M60/36—Medical purposes thereof other than the enhancement of the cardiac output for specific blood treatment; for specific therapy
- A61M60/37—Haemodialysis, haemofiltration or diafiltration
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/40—Details relating to driving
- A61M60/403—Details relating to driving for non-positive displacement blood pumps
- A61M60/419—Details relating to driving for non-positive displacement blood pumps the force acting on the blood contacting member being permanent magnetic, e.g. from a rotating magnetic coupling between driving and driven magnets
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/40—Details relating to driving
- A61M60/403—Details relating to driving for non-positive displacement blood pumps
- A61M60/422—Details relating to driving for non-positive displacement blood pumps the force acting on the blood contacting member being electromagnetic, e.g. using canned motor pumps
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/50—Details relating to control
- A61M60/508—Electronic control means, e.g. for feedback regulation
- A61M60/538—Regulation using real-time blood pump operational parameter data, e.g. motor current
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/80—Constructional details other than related to driving
- A61M60/802—Constructional details other than related to driving of non-positive displacement blood pumps
- A61M60/818—Bearings
- A61M60/825—Contact bearings, e.g. ball-and-cup or pivot bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/021—Units comprising pumps and their driving means containing a coupling
- F04D13/024—Units comprising pumps and their driving means containing a coupling a magnetic coupling
- F04D13/026—Details of the bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/021—Units comprising pumps and their driving means containing a coupling
- F04D13/024—Units comprising pumps and their driving means containing a coupling a magnetic coupling
- F04D13/027—Details of the magnetic circuit
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/046—Bearings
- F04D29/0465—Ceramic bearing designs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/0408—Passive magnetic bearings
- F16C32/0423—Passive magnetic bearings with permanent magnets on both parts repelling each other
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/10—Location thereof with respect to the patient's body
- A61M60/122—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body
- A61M60/126—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel
- A61M60/148—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2316/00—Apparatus in health or amusement
- F16C2316/10—Apparatus in health or amusement in medical appliances, e.g. in diagnosis, dentistry, instruments, prostheses, medical imaging appliances
- F16C2316/18—Pumps for pumping blood
Definitions
- the present invention relates to a centrifugal pump comprising a pump head and a drive for delivering blood and other shear-sensitive fluids, such as cell-containing cleaning suspensions, for example, in blood-cleaning units.
- centrifugal pumps for delivering sensitive fluids which can change in their composition owing to excessive friction and shear stress.
- such pumps are used, For example, for heart-lung machines, for supporting the failing heart, as well as for purpose of blood preparation for suspensions of cells or biologically active particles.
- the rotor of the pump is mostly driven via a conventional motor, it being the case either that the energy is injected into the magnets of the pump rotor via an additional magnet disk of the drive, or that the magnets of the pump rotor are lengthened in the axial direction and are therefore arranged as rotor of electric motor in the rotary field of the stator.
- the aim is a pump/drive combination of low overall height and of low volume and weight.
- a pump of low design is proposed in the PCT application WO-92/03 181-A1, Baylor College.
- the magnetic disk driven by the disk-rotor stator is used simultaneously for the magnetic coupling of the rotor.
- a considerable volume of iron is required for the magnetic return path and, at the same time, a relatively low magnetic saturation is achieved.
- a pump has become known (via Schima et al., Artificial Organrs 19:7 (1995), Pages 639-643) in which coupling of the magnetic circuits of the motor and pump rotor is performed.
- the rotor is stabilized by three supporting points on the pump base, and this can lead to increased blood traumatization during the conveyance of blood.
- a pump has become known (Yamane et al: Artificial Organs 19:7 (1995), Pages 625-630) in which there is a magnetic suspension of the rotor on the tip facing the intake, fit being the case there, however, that because of the unfavorable distribution of the magnetic forces the overall height must be relatively large and the intake is disturbed.
- the object of the present invention to create and improve the pump of the type described at the beginning and the drive therefore, in which the existing disadvantages are avoided.
- the pump is intended to have a low overall height and low volume and weight, as well as a high operational reliability.
- the unfavorable mechanical effects on the delivered medium, such as high shear forces, are to be avoided.
- the present invention is defined by virtue of the fact that the drive has a drive rotor with a rotor disk which is provided with permanent magnets which are assigned permanent magnets, fitted on the pump rotor, for the purpose of magnetic coupling, and are assigned in the drive to the magnetic coils of a stator for the purpose of generating the rotary movement, and in that the pump rotor axis extends into the pump intake and is magnetically centered in the pump intake.
- the latter for the purpose of magnetically centering the pump rotor axis the latter has a permanent magnet
- the pump intake has one or more annularly arranged magnets polarized in the same direction.
- the magnets can be permanent magnets or electromagnets.
- the magnets can preferably be arranged in the wall of the pump intake, an annular flow channel being formed between the pump rotor axis and the wall of the pump intake.
- the permanent magnet on the pump rotor axis or the pump rotor can be offset in the axial direction with respect to the annularly arranged magnets of the pump intake, in order to increase the centering effect.
- Controls are arranged on the wall of the pump intake or on the pump rotor axis, magnets or their yoke projecting if appropriate into the region of the control surfaces.
- One or both magnets of the pump intake can have oblique or contoured surfaces on their sides facing one another.
- the bearing of the pump rotor is constructed as a magnetic bearing on the rear wall of the pump head, this bearing comprising one or more permanent magnets In the rear rotor tip on the rear side of the rotor and permanent magnets and/or electromagnets in the bearing shell formed by the rear wall.
- the bearing of the pump rotor on the rear wall of the pump head can be constructed as a magnetic bearing, on the rear wall of the pump head, this bearing comprising one or more permanent magnets in the rear rotor tip on the rear side of the rotor and permanent magnets and/or electromagnets in the bearing shell formed by the rear wall.
- the bearing seat of the pump rear wall can be designed with a flat central surface for the rear rotor tip, which surface permits lateral excursions of the rear rotor tip in a limited range of typically 0.5 to 3 mm diameter.
- the pump rotor has on its rear side vanes which during rotation produce a dynamic pressure by virtue of a different inclination of the vane surfaces on the upstream side and downstream side, and thereby facilitate and/or cause lifting of the pump rotor from the rear wall.
- the pump rotor can be designed with exposed rotor vanes in which there are recessed magnets whose magnetization runs transverse to the rotation axis of the pump rotor axis.
- the rotor vanes can have different surfaces and/or angles of attack, and thereby cause an asymmetrical flow on the rear wall of the pump.
- the drive rotor comprises an upper and a lower rotor disk and the magnet coils of the stator are situated between the two rotor disks.
- the lower rotor disk of the drive can have a magnetic return path in the form of a magnetically conductive disk or ring made, for example, from soft iron.
- the coils can be arranged in a plurality of offset layers and/or wound inclined to the plane of the coil form.
- the drive rotor can comprise an upper rotor disk, and provided in the stator instead of the lower rotor disk is a magnetic yoke which interconnects the iron cores of the magnet coils of the stator.
- a magnetic yoke which interconnects the iron cores of the magnet coils of the stator.
- circular and/or radial depressions or also slots can be provided in the rear wall of the pump or, in the case of a separable pump and drive, on the covering wall of the drive.
- a pump head is fitted on both sides of the drive in the axial direction, preferably for the purpose of simultaneously supporting/substituting left-hand and right-hand halves of the heart, it being possible for the size and rotor configuration of the two pump heads to differ in order to achieve a pumping capacity matched to the physiological requirements.
- the pump head and the drive are preferably separated from one another in order to replace the pump head or the drive alone.
- FIG. 1 shows a first embodiment of the pump according to the invention
- FIGS. 2a, 2b, 2c and 3 are sections along the line A--A through the pump, with a different design of the rotor and the stator windings, the housing parts having been left out to improve clarity.
- FIG. 2c shows, by way of example, the rear view of a rotor without a closed rear wall, with exposed vanes and magnets integrated therein.
- FIG. 4 shows an embodiment with electromagnets, a detailed view relating to the bearing of the rotor tip in the rear wall of the pump being given in FIG. 5.
- FIG. 6 shows a design with a motor and two pump heads.
- FIG. 7 represents a detail of a side view of the side of a rotor with rear wall
- FIG. 8 represents the rear view of this rear wall.
- FIG. 9 shows an embodiment of electromagnets on the rotor tip for FIG. 4.
- FIG. 10 shows an embodiment of the rear rotor tip in a bearing without centering function.
- FIG. 11 to FIG. 14 show embodiments for the magnetic bearing of the rotor tip with arrangements of control surfaces either in the pump housing or in the inflow region of the rotor, and a possible multiplication of the magnets in the inflow region.
- FIGS. 15 and 16 show the plan view of the rear side of the rear wall of the pump head and an or associated cross-section with arranged depressions for minimizing the eddy current losses.
- FIG. 17 shows the design of a rotor vane with supporting surface near the base.
- FIG. 18 is a diagram of a rotor with differently shaped vanes for achieving a flow eddy with a center point off the rotor axis.
- the pump head 1 contains a pump rotor 3 with rotor blades 32, which causes the fluid entering the pump head through the pump intake 11 to rotate and presses it through the pump outlet 12 by means of the centrifugal force produced by the rotation.
- Both the pump rotor 3 and the two rotor disks 5, 8 of the drive rotor 64 of the drive 2 have permanent magnets (drive magnets 7, 33), the drive magnets 7 of the motor rotor disks 5, 8 being in each case alternately differently polarized. In this case, use is preferably made of 6, 12, 18 or 24 magnets per disk.
- Rotor disks 5, 8 of the drive 2 are arranged rotatably, either the axis 9 being rotatable, or the two rotor disks 5, 8 being mounted on a fixed axis 9 via one or more bearings 10.
- a stator or coil form 13 Arranged between the two rotor disks 5, 8 is a stator or coil form 13 with magnet coils 4 which are connected via the supply lead 41 to the electric rotary field, and thereby generate the electromagnetic motor rotary field.
- the required commutation of the electric field is preferably performed by means of an electronic circuit in a known way by evaluating the backward EMF, it being possible for this circuit also to be integrated into the drive itself.
- the magnets 33 in the pump rotor can be arranged either parallel to the drive magnets 7 of the drive 2, or, preferably as represented in FIG. 2a, be arranged transverse to the drive magnets 7 for the purpose of reducing the forces acting laterally on the pump rotor 3.
- the magnetic field lines 44, and thus the forces, then act to a considerable extent transverse to the bearing axis, the tilting torque being substantially reduced as a result.
- the coils 14, 15, 16, shown in FIGS. 2a and 2b and 3, of the coil form 13 can either be situated next to one another or, as shown in FIG. 2a, be arranged in a plurality of layers offset one above another or, as shown in FIG. 3, be arranged in an obliquely overlapping fashion.
- Iron cores or beds of iron cores 45 can be provided in order to increase the magnetic flux.
- the pump rotor 3 can, however, also be designed with exposed vanes 51 into which magnets 50 for magnetizing transverse to the axis are recessed.
- the pump rotor 3 is mounted magnetically in the intake. Accommodated for this purpose on its pump rotor axis 61 or rotor tip 49 thereof is a permanent magnet 34 opposite which there is situated around the intake 11 an annular magnet arrangement 35 polarized essentially in the same direction. As represented in FIG. 1, this magnet 35 is preferably designed as a purely permanent magnet. As shown in FIG. 4 and FIG. 9, however, it is also possible to provide additional, electromagnetic coils 42 with iron yokes 43, for the purpose of improving the stabilization.
- the magnets 35 are preferably arranged in the wall 62 of the pump intake 11, in order not to impede the intake through the annular flow channel 63.
- the bearing on the rear wall 20 of the pump head can be designed as a pivot bearing (FIG. 1).
- FIG. 5 shows a possible design of this magnetic bearing, which has a permanent magnet 39 in the rear rotor tip and has electromagnetic coils 46 in the bearing shell and, additionally, can have a permanent magnet 47.
- the check-back signal For the magnet position can be determined in this case either from the impedance of the coils 46 or by position sensors.
- the lower rotor bearing can also be designed with a flat bearing seat 52 in which the bearing tip 36 of the rotor rear side can execute transverse movements within a certain range without mechanical limitation, in order to permit the bearing seat to be cleaned automatically of blood constituents, there being a need to provide a flat region of typically 0.5 to 3 mm diameter.
- the bearing seat 52 can preferably be made in this case from ceramic or high-density plastic.
- FIG. 7 in the side view of the rotor rear side, and in FIG. 8 in a plan view thereof, it is possible to fit on the rear side of the pump rotor 3 7,vanes 27 whose shape facilitates controlled lifting of the rotor from the pump rear wall 20 and the middle piece thereof. Because of the rotation 28 of the pump rotor 3, the incoming fluid 29, which strikes the vanes 27 produces a dynamic pressure on the flat inclined upstream side, while low corresponding counter-pressure is built up on the steeply set rear side 31 of the vanes.
- either an asymmetrical configuration of the permanent magnet 47 (FIG. 5) or a bipartite outlet can be provided for equalizing the forces on the circumference of the rotor, which act eccentrically in the case of a single outlet.
- the pump head and drive can be designed separately from one another, as represented in FIG. 1.
- the pump head is to be designed such that zones of higher shear forces are avoided as far as possible.
- the pump can be fitted with two pump heads 1 in order to permit both the left-hand and the right-hand ventricle to be supported by one system.
- the pump heads and rotors can be designed with a different diameter and/or with a different rotor configuration in order to adapt to the different required pumping capacities of the two ventricles.
- control surfaces 54, 58 can be arranged in the inflow region of the pump an order to enlarge the hydrodynamically active gap between the rotor and housing, and to increase the efficiency.
- these control surfaces are preferably fitted on the inside of the wall 62 of the pump intake 11, it being possible to pull the magnet 35 forward into the control surfaces in order to shorten the magnetically active air gap or to provide iron yokes 55 for relaying the magnetic field into the vane.
- These control surfaces 54 can also be set obliquely or be curved in this case in order to improve the hydrodynamic properties.
- the drive can also be carried out only with a single top rotor disk 8, the magnetic feedback taking place in this case on the rear side of the motor via an annular magnet yoke 53 which interconnects the iron core 45 of the motor coils 14, 16 (see also FIGS. 2a to 3).
- the magnets 34, 35 can have an obliquely set or contoured wall in order to achieve a controlled variation of the air gap width, and thus of the magnetically generated restoring force in the case when the rotor is lifted.
- the magnet 34 can, for example, be domed (indicated by dashes in FIG. 11).
- control surfaces 58 on the pump rotor 3 instead of stationary control surfaces 54 on the pump housing, it is also possible to provide an arrangement of control surfaces 58 on the pump rotor 3 itself, as is represented in FIGS. 13 and 14, it also being possible in this case to provide an extension of the magnet 34 into these control surfaces 58 or iron yokes 55, in order to reduce the magnetically active air gap.
- the moving magnetic field produces eddy currents between the drive rotor disk 8 and permanent magnet 33 of the pump rotor. It is possible for the purpose of reducing these eddy currents to increase the electrical resistance of the rear wall 20 by means of depressions 59. 60, which are represented in FIGS. 15 and 16. These depressions can be provided in a circular arrangement 59 and/or in a radial arrangement 60, it being necessary to take account of the mechanical strength of the pump and of the drive in the case of the number and shaping. If the rear wall of the pump 20 and the covering wall of the drive are of separate design in order to permit the pump and drive to be more easily separated, depressions in the covering wall of the drive can also be designed as slots.
- the pump rotor vanes can also be equipped with a supporting surface 57 in the vicinity of the pump base 20, in order to permit a reduction, caused hydrodynamically by the rotation, in the contact pressure in the bearing, or a lifting of the rotor. It is also possible to arrange supporting surfaces 67 on the other side of the pump rotor.
- the vanes of the rotor can be of different (asymmetrical) design, it being possible to provide a different height of the vane, but also a different inclination of the vanes (see the different shape of the surfaces 68).
Abstract
Description
Claims (23)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0135796A AT404318B (en) | 1996-07-29 | 1996-07-29 | CENTRIFUGAL PUMP CONSTRUCTING A PUMP HEAD AND A DISC DRIVE FOR CONVEYING BLOOD AND OTHER SCISSOR-LIQUID LIQUIDS |
AT1357/96 | 1996-07-29 | ||
PCT/AT1997/000173 WO1998004834A1 (en) | 1996-07-29 | 1997-07-23 | Centrifugal pump for pumping blood and other shear-sensitive liquids |
Publications (1)
Publication Number | Publication Date |
---|---|
US6155969A true US6155969A (en) | 2000-12-05 |
Family
ID=3512147
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/230,125 Expired - Fee Related US6155969A (en) | 1996-07-29 | 1997-07-23 | Centrifugal pump for pumping blood and other shear-sensitive liquids |
Country Status (9)
Country | Link |
---|---|
US (1) | US6155969A (en) |
EP (1) | EP0916025A1 (en) |
JP (1) | JP3594315B2 (en) |
CN (1) | CN1234854A (en) |
AT (1) | AT404318B (en) |
AU (1) | AU3612997A (en) |
BR (1) | BR9710891A (en) |
CA (1) | CA2264538A1 (en) |
WO (1) | WO1998004834A1 (en) |
Cited By (41)
Publication number | Priority date | Publication date | Assignee | Title |
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US20040143151A1 (en) * | 2002-12-17 | 2004-07-22 | Terumo Kabushiki Kaisha | Centrifugal blood pump apparatus |
US20040241998A1 (en) * | 1999-01-22 | 2004-12-02 | Hanson Kyle M. | System for processing a workpiece |
WO2005028000A1 (en) * | 2003-09-18 | 2005-03-31 | Myrakelle, Llc | Rotary blood pump |
US20050135942A1 (en) * | 2003-09-25 | 2005-06-23 | Medforte Research Foundation | Streamlined unobstructed one-pass axial-flow pump |
US20050135948A1 (en) * | 2003-09-25 | 2005-06-23 | Medforte Research Foundation | Axial-flow blood pump with magnetically suspended, radially and axially stabilized impeller |
WO2007040663A1 (en) * | 2005-10-05 | 2007-04-12 | Heartware, Inc. | Axial flow pump with multi-grooved rotor |
US20080021394A1 (en) * | 2006-01-13 | 2008-01-24 | Larose Jeffrey A | Stabilizing drive for contactless rotary blood pump impeller |
US20080199357A1 (en) * | 2006-12-07 | 2008-08-21 | Levitronix Llc | Integrated centrifugal blood pump-oxygenator, an extracorporeal life support system and a method of de-bubbling and priming an extracorporeal life support system |
US20090203957A1 (en) * | 2008-02-08 | 2009-08-13 | Larose Jeffrey A | Ventricular assist device for intraventricular placement |
US20090226293A1 (en) * | 2005-07-06 | 2009-09-10 | Sumco Techxiv Kabushiki Kaisha | Method and Apparatus for Manufacturing Semiconductor Wafer |
US20090234447A1 (en) * | 2007-04-30 | 2009-09-17 | Larose Jeffrey A | Centrifugal rotary blood pump |
US20100040491A1 (en) * | 2005-09-05 | 2010-02-18 | Tokyo Institute Of Technology | Disposable centrifugal blood pump with magnetic coupling |
US7699586B2 (en) | 2004-12-03 | 2010-04-20 | Heartware, Inc. | Wide blade, axial flow pump |
US20110009687A1 (en) * | 2007-02-27 | 2011-01-13 | Miracor Medical Systems Gmbh | Catheter to assist the performance of a heart |
US20110054380A1 (en) * | 2003-02-13 | 2011-03-03 | Wieting David W | Method and apparatus for removal of gas bubbles from blood |
US7972122B2 (en) | 2005-04-29 | 2011-07-05 | Heartware, Inc. | Multiple rotor, wide blade, axial flow pump |
US8007254B2 (en) | 2004-12-03 | 2011-08-30 | Heartware, Inc. | Axial flow pump with multi-grooved rotor |
AU2013205145B2 (en) * | 2005-10-05 | 2013-08-15 | Heartware, Inc. | Axial flow pump with multi-grooved rotor |
US8672611B2 (en) | 2006-01-13 | 2014-03-18 | Heartware, Inc. | Stabilizing drive for contactless rotary blood pump impeller |
US9512852B2 (en) | 2006-03-31 | 2016-12-06 | Thoratec Corporation | Rotary blood pump |
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Also Published As
Publication number | Publication date |
---|---|
CA2264538A1 (en) | 1998-02-05 |
JP3594315B2 (en) | 2004-11-24 |
ATA135796A (en) | 1998-03-15 |
WO1998004834A1 (en) | 1998-02-05 |
AT404318B (en) | 1998-10-27 |
CN1234854A (en) | 1999-11-10 |
BR9710891A (en) | 2000-01-11 |
JP2000509311A (en) | 2000-07-25 |
EP0916025A1 (en) | 1999-05-19 |
AU3612997A (en) | 1998-02-20 |
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